What is 15/49 plus 9/13? (Answer: 636/637)

Exact Answer

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Problem: What is 15/49 plus 9/13?
Formula / Expression: 15/49 + 9/13
Final Answer: 636/637
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 49 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 49 × 13 = 637.
Working: LCD(49, 13) = 637

Step 2: Convert to Equivalent Fractions with Common Denominator 637
Multiply the numerator and denominator of 15/49 by 13, and multiply the numerator and denominator of 9/13 by 49 so both fractions share the common base 637.
Working: 15 × 13/49 × 13 = 195/637 and 9 × 49/13 × 49 = 441/637

Step 3: Add the Numerators
Now add the numerators (195 + 441 = 636) and keep the common denominator 637 unchanged.
Working: 195 + 441/637 = 636/637

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 636 and 637 is 1, confirming that 636/637 cannot be reduced further—it is already in its simplest irreducible form.
Working: 636/637

Step 5: Decimal & Percentage Representation
Dividing the numerator 636 by denominator 637 produces a repeating decimal (approximately 0.99843, or 99.843%).
Working: 636 ÷ 637 = 0.99843 (99.843%)

Key Values:
- Simplified Fraction: 636/637
- Mixed Number Form: 636/637
- Decimal Value: 0.99843
- Percentage: 99.843%

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Solved with FractionsCalc:
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15/49 + 9/13 = 636/637

Simplified Fraction

636/637

Mixed Number

Proper (636/637)

Decimal Value

0.99843

Percentage

99.843%

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Step-by-Step Solution: 15/49 + 9/13

Step 1

Find the Least Common Denominator (LCD)

The denominators 49 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 49 × 13 = 637.

LCD(49, 13) = 637

Step 2

Convert to Equivalent Fractions with Common Denominator 637

Multiply the numerator and denominator of 15/49 by 13, and multiply the numerator and denominator of 9/13 by 49 so both fractions share the common base 637.

15 × 13/49 × 13 = 195/637 and 9 × 49/13 × 49 = 441/637

Step 3

Add the Numerators

Now add the numerators (195 + 441 = 636) and keep the common denominator 637 unchanged.

195 + 441/637 = 636/637

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 636 and 637 is 1, confirming that 636/637 cannot be reduced further—it is already in its simplest irreducible form.

636/637

Step 5

Decimal & Percentage Representation

Dividing the numerator 636 by denominator 637 produces a repeating decimal (approximately 0.99843, or 99.843%).

636 ÷ 637 = 0.99843 (99.843%)

Visual Representation

The diagram below illustrates 15/49 plus 9/13 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`636/637`
Mixed Number Form	`636/637`
Decimal Form	`0.99843`
Percentage	`99.843%`

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Frequently Asked Questions

What is 15/49 plus 9/13 as a fraction?

15/49 + 9/13 in simplest fraction form is 636/637.

What is 15/49 plus 9/13 as a decimal?

15/49 + 9/13 converted to a decimal is 0.99843.

What is 15/49 plus 9/13 as a percentage?

15/49 + 9/13 expressed as a percentage is 99.843%.

Does 15/49 plus 9/13 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.99843...) because the denominator contains prime factors other than 2 and 5.